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# How do I find the base used?

Anonymous
wrote...
A month ago
 How do I find the base used? https://youtu.be/YVvfY_lFUZ8 This video discusses how mathematicians are using a counting system that is not base-10 to investigate ways to find prime numbers. Identify what base is being used and briefly explain how it is "easier" to tell if a number is prime in that base counting system.I am very lost on what base he is using in this video. I know he uses base 3 later on but I thought it was base 10, however the question seems to negate that... Thanks. Read 36 times 2 Replies

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Replies
wrote...
Educator
A month ago Edited: A month ago, bio_man
 At the five minute mark, they use a base 3.It's easier to use base three because it consists of only {0,1,2} as digits to represent all numbers. They found other than the prime number 3 (103), all prime numbers written in base-3 end in 1 or 2 (with the exception pointed out).I didn't watch beyond that mark. Hopefully they don't expand on it.
Anonymous Author
wrote...
A month ago
 Thank you. They don't seem to use any other bases.
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